# A081663 (b-file synthesized from sequence entry)
0 1
1 3
2 9
3 25
4 66
5 169
6 425
7 1058
8 2621
9 6485
10 16066
11 39921
12 99601
13 249666
14 628917
15 1592029
16 4048866
17 10341577
18 26517113
19 68226722
20 176065901
21 455514533
22 1181040514
23 3067684065
24 7980068641
25 20784441474
26 54188706405
27 141395801773